Machine for grooving fibrous board



July 24, 1934. J. T ROBINSON ET AL 1,967,262

MACHINE FOR GROOVING FIBROUS BOARDv BY Y;

ATTORNEY July 24, 1934 J. T. ROBINSON ET AL 1,967,262

MACHINE FOR GROOVING FIBROUS BOARD Filed Deo, 23, 1931 2 Sheets-Sheet 2Tg5. f2

Patented July 24, 1934 UNITED STATES PATENT oFFicE MACHINE FOR GROOVIGFIBROUS BOARD JohnT. Robinson and Theodore A. Schwamb,

Y Boston, Mass.

Application December 23, 1931, Serial No. 582,788 14 Claims. (Cl.1644-60) VThe present invention relates to means for iibrousboards to becut differ in structure and producing grooves in fibrous board, which istoughness of material, the cutting edges of the thick enough to be sogrooved, the general obtwo knives of each cutting unit, though runningjects of the invention being to'cut grooves in very close to each otherwith a `slight lateral vboard of .suitable thickness preferably toenable spacing, should not touch and dull each other, 60 the board, ifbendable to be bent at anglesY which as is apt to be the case in cuttingsome fibrous may be defined and determined quite` approxiboard which istougher than other board, and mately by the shapesvand depths of thegrooves, may be the case in cutting boards of most `any such board beingtherefore adapted to be bent degree of toughness. l into shapes so as toform hollow or body por- The preferred construction and operation of 65tions' of boxes or any other shapes to which the the parts of eachcutting unit, if so desired, is

board is adapted, such board usually being lamsuch that the same lendsitself to a tilting or inated paper board. The boardmay be-of anytipping' of the whole unit, with a View to adaptsuitable materialslaminated to the desired ing the'cutters to tend to pull apart insteadof l thickness, and which in theY case of its ultimate having a tendencyto draw together and damage 70 i use in making paper boxes need only beof lameach other, as by dulling the cutters, and as inated material ofsuiiicient strength and thicksuch a type'of cutting unit is desirable inthese ness to keep itself substantially intact for being connections,the invention in this respect resides set up into boxes, such as cigar,candy and any in the combination of a board supporting roller,

other boxes for which fibrous or paper board is a cutter support, a pairof opposed, rotary, disk- 75 adapted to be used, whether the groovedboard `cutters arranged in planes intersecting the roller is bent oneway or `the other. The grooved and convergingly toward the roller so asto cut board may be used entirely fiatv for other puralong the pathtaken by the board, and means POSGS- for adjusting and setting thecutters with re- One of the specific objects of the invention spect totheir support so that in operation their 80 preferably is to cut aV-shaped groove in heavy closest points laterally lie across the line ofa or thick fibrous bendable board, so that when groove to be cut andsubstantially in planes the board is folded with the groove located onwith that of the axis of the roller or in planes the inside, it willfold to any suitable angle, inclined to aforesaid axial plane.

preferably a rightl angle, and leave no substan- These being preferablyamong `the objects of 85 tial `openings or spaces inside of the fold,inasthe invention, together with others, the invenmuch as it ispreferred that the side walls of tion consists of certain features ofconstruction the groove abut against each other, thereby andcombinations of parts to be hereinafter forming a mitre joint along theline ofthe origparticularly described and then claimed withreinalgroove. spect to the accompanying drawings illustrating 90Afurther speciiic object of the invention may an embodiment of theinvention and wherein be, and preferably is, to cut intersecting groovesFig. 1 is a sectional View of a simple typeof in brous board so thatwith a suitable number machine to which one of the cutting units of`cutting units, two pair of parallel grooves shown in operation isadapted to be applied;

may be cut each time so that when the cut Fig. 2 is an end elevation ofa cutting unit 95 blank is folded up, there is readily formed fourapplied to parts of the machine which are shown sides of an open orhollow box-body. as broken away;

When it is desired to obtain corners of boxes Fig. 3 is a plan of theslide member or block or other articles, which corners shall be formedon which the cutters are to be mounted;

.5 at the desired angles, preferably right angles, Fig. 4 is atransverse sectional elevation on 100 and no morev or no less, there isneed for adthe line 4-4, Fig. 1, the parts being enlarged justmentin thecutting units so as to enable this to the size of Fig. 2; to be donewith dilerent types of fibrous board Fig. 5 is an underside plan of oneof the cutand Where there are different directions of ting units; Y

53 grain in the same board. Furthermore, it has Fig. 6 is a, partialsection through the cutting 105 been fOUTld 'in practice that theCutting units unit to show how the cutters are mounted ad should havetheir knives or cutters set inproper justably upon slide member of Fig.3; Y `relation to each other so that they will cut.. Fig. 7 is a detailelevation of one ofthe cutcut ythe Waste quite cleanly. Furthermore, itvters and its individual slide member;

has been found that owing to the fact lthat Fig. 8 is Van enlarged view,similar to Fig. l, 110

to illustrate a tipped or tilted position of the cutting unit withrespect to the parts; and

Fig. 9 is a diagrammatic view to partially illustrate what occurs incutting a groove, when 1i the cutting unit is tilted in Fig. 8.

respective sides. of the stock or body 17.

Referring to Figs. 1, 2 and 4 of the drawings, it is assumed that amachine having a suitable frame is provided with a pair ofsteel feedrollers 19, 11, together with another pair of steel feed rollers 12, 13,these rollers being all parallel the one with the other, so as to feed aibrous or paper board evenly in the line of feed, which is at rightangles to the axes of the rollers. Upon the frame oi the machine thereis supported a beam or supporting bar `14 of suitable length, andparallel with the feed rollers, such being preferably mounted at eachend upon trunnions which are indicated by the dotted circle in Fig. 1,so that the beam may be given a half turn so as to dispose the cuttingunits which are mounted thereupon in one direction or the other,accordingto `the position in which the cutting units do their work uponthe board, or in a reverse position, so that they Lare accessible formounting them upon the beam or for the adjustment of the parts of theunits. Upon the frame of the machine there is also mounted a roller ordisk 15, the axis of which is parallel with the axes of the feed rollers10, ill, 12, 13, it being located intermediate of the two pairs of feedrollers, and while the feed rollers are positively driven, preferablythe roller or disk :15 runs idle.

Referring to Figs. 1 to 6 inclusive, there is illustrated a singlecutting unit .16 which is mounted upon the beam -or bar 14, but it is tobe understood that in practice, and particularly when intersectinggrooves are to be cut in iibrous board, a number of the cutting unitsare Linounted similarly to the illustrated unit. In such .case it ispreferred that thel beam or supporting beam 14 carry one pair of cuttingunits similar to the unit 16 for cutting a pair of par-k allel groovesin one direction and that at an- ?.other` location on the beam anotherpair of such cutting -units is provided so as to cut a pair of groovesintersectingly with the grooves referred to, whereby to enable blanks tobe grooved for use in makingY boxes, but of course `the number ofcutting units may be varied according to the nature and construction ofthe article to be ultimately produced from the grooved nbrous board. Theparts of the cutting unit 16 are made of hard metal, preferably steel.'

The cutting unit 16 includes a unitary blockbody or stock 17, and whichis suitably recessed to provide a pair of posts or legs 18, 19 andanother pair of posts 20, 2l.

4.19 and 20, 21 are separated by spaces 22 which extend lengthwise ofthe stock 17, and the two separate pair of posts are separated by spaces23 which extend at right angles to the spaces 22. The inner walls of allof the posts or legs .extend parallel with each other, the postsextending at right angles to the main plane of the stoel; 17.

A slide member 24 having parallel sides extending lengthwise thereof ismovably tted be- .1 tween the opposed inner faces of the posts 18,

19 of one pair and the posts 2G, 2l. ofthe other pair, and is providedat opposite sides with laterally extending wing portions 25 which arelocated in the spaces 23 between two posts at the Said The posts of eachpair 13,.

member 24 also has extensions 26 which are arranged at right angles tothe lateral wing portions 25 and are guided in the spaces 22 between theposts of each pair. Inasmuch as the surfaces of the posts which areopposite to the member 24 are parallel with each other, the opposedfaces of the lateral portions 25 and the extensions 26 are also parallelwith each other and with the said surfaces of the posts. The t is quitea snug one, so that the slide member 24 can be adjusted in its own planeparallel with the main plane of the body or stock 17.

The extensions 26 of the slide member 24 are provided in those faceswhich are opposite to the stock 17 with undercut recesses 27 shown moreclearly in Fig. Y1. Screw-threaded adjusting stems 28 are threaded inthe screw-threaded openings in the end portions of the stool: 15 and areprovided at their inner ends with heads 29 positioned in the undercutsor recesses 27, in such a way that the adjustment of the stems 2S in onedirection or the other will either draw the slide member 24 towards thestock 17 or push it away `from the stock. Knurled and niclred heads 30are removably mounted upon the exposed outerends of the stems 28, theybeing held rigidly with the stems by means of driven pins 31, which maybe removed in order to permit removal of the heads from the stems,

if desired. Removal of the heads, however, will probably not benecessary, but the construction in this respect is desirable in order inthe first instance, when the parts are being assembled, to enable theouter ends of the screw-threaded stems 28 to be threaded outwardly intothe screw-threaded openings of the stock 17 when the slide member 24 hasbeen entered between the posts of each pair 18, 19 and 20, 21. When thestems have been screwed far enough, the

screw-heads 30 are fixed rigidly thereupon and then the stems may beadjusted so as to give the desired adjustment to the slide member 24.When the desired adjustment of the slide memn ber has been accomplished,lock-nuts 32, ap-

plied to the-screw stems before the screw-heads if" 30 have been mountedupon them, are adjusted into a binding engagement with the adjacentportions of the stock 17, thereby to rmly hold the slide member 24 in apredetermined position.

The lateral wing portions 25 of slide-member 24 are provided, as moreclearly shown in Fig. 3, with two flat faces 33, 33, at the oppositeside of the slide member away from the stock 17. It is more clearlyshown in Figs. 2 and 4 that these flat faces extend in inclined planeswhich converge in a direction away from the slide member, or rather awayfrom the stock 17. These converging flat faces 33 determine theinclination of the parts which are mounted thereupon. versely ofy one ofthe fiat faces 33 and a guideseat 35 is formed transversely of the otherflat face 33. These seats are in the form of recesses in theslide-member 24, preferably of dovetail shape in cross-section. 33 areundercut, and the recesses thus formed have their walls extending atright angles to A guide-seat 34 is formed transl' Hence the faces "YThis :is t

the formationrof ample inclined faces 33 and to receive atone sde'oieach of the recesses 34,

a binding screw 36, for securing certain parts in the recesses.

A pair of bifurcated slides 37, 38, having flat faces, extendstransversely of the seats 34, 35.`

One leg or bifurcation of each slide 37, 38is provided with an integraldove-tail projecting way 39 which isv adapted to fit slidingly in acorresponding recess 34 or 35. The nt is a snug yet a loose enough oneto permit `lateral adjustment of each bifurcated slide 37, 38. It willbe seen that the closedA ends of the bifurcations of the slides aredirected in the direction of the feed of the brous board A upon theroller or disk 15, and that lengthwise lof eachother the slides areoffset similarly 'to the offsetting of the seats 34, 35.

The spaces between the bifurcations of the slides 37, 33 provide slotsl40, one in each slide, and these' slotshave their walls parallel witheach other and with the `corresponding inclined face 33 of theslidemember 24. Lengthwise of the bifurcatedslide members, their'inner facesrest upon and are guided upon the inclined faces 33 of the slide member24. Inclined surfaces 20a. upon each of the posts or legs 20, .21 aresubstantially co-planar with inclined surfaces 33 so as to permitadjustment of the bifurcated slides 37, 38 upon the inclined faces 33.Within slot 40 of slide 37 there .is mounted a knife-edged cutting disk41 and a similar cutting disk 42 is mounted in the slot of the slidemember 38. These cutting` disks are of exceedingly hard steel so as toendure in their work, and the opposite faces of each cutting disk areparallel the one with the other, each diskbeing of a substantialthickness so as to snugly fit the slot, yet the fit is loose enough atleast to permit fairly rapid rotation of each cutting disk, the knifeedges of which project a suitable distance beyond the slides supportingthe disks. It will benoted that annular beveled surfaces 43 are formedat the inner sides of the edge portions of each `cutting disk, thesesurfaces extending to the edges of the disks so as to provide them withsharp knife edges. An ample V-shaped throat is thereby provided betweenthe closest points of approach to each other of the bevel-surfaces 443,as shown in Fig. 4.

Referring to Fig. 6 it is more clearly seen how each of the cuttingdisks or knivesV is mounted rotatably in the `desired position. `Eachcutting disk is provided with a strong and fairly large journal shaft 44which passes through a smooth hole 45 in theidisk so as to provide acylindrical bearing surface for the cutter upon shaft 44. Such a shaft44 passes through a smooth hole in the outer bifurcation of each slide37, 38, and then enters a threaded hole 47'extending into the projectingway 39, the corresponding portion of the journal shaftY 44 beingscrewthreaded so that it may be firmly screwed linto` the hole 47. Theouter end of each journal shaft 44 is provided'with a large nicked head`49 which is adapted to rmly bear upon "the outer bifurcation of eachslide. It will be seen that the journal shafts 44 divergeV away from' ofthe cutting unit, that is to say these planes diverge 'away from thesides of the cutting unit. The outer fiat face of each cutting disk willtherefore be parallel with the corresponding inclined face of the slidemember 24.

A thrust member 50 is rigidly secured by screws 51 to each of the outerfaces 52 of the lateral wing portions 25 of the slide member 24. Thescrews for the thrust member 50 are arranged to each side of seat 34 andseat 35. The thrust members 50 are elongated and intermediately of thelength thereof they are provided with outwardly projecting lugs 33arranged in inclined planes with respect to the planes of the faces 52upon which the thrust members are secured. Said lugs 53 are providedwith screw-threaded holes to receive thrust screws 54, the inner ends of'which abut the adjacent ends of the projecting ways 39 of slides 37,33. By adjusting the thrust screws 54 the slides 37, 38 are adapted tobe moved in one direction or the other, and when they are in therequired position, such position is fixed by means of the set-screws 36.

Referring `more particularly to Fig. 1, the beam or bar 14 is shown asprovided with a dove-tail rib or projecting way 55 which as shown inFig. 2 .extends longitudinally of beam 14, so that other cutting unitsmay be positioned along the beam. The stock or body 17 cf the cuttingunit 16 is provided with spaced back portions 56, 57 which extendtransversely of the stock17,'andbetween them there is located atransverse recess 53 which is undercut in the back portion 57, while atthe opposite side of the recess it has a surface inclined in the samedirection on back portion 56 as the surface at the undercut side. Itwill be noted that the back portions 56, 57 are of different heights,the back portion 57 being lower than 56.A

Adjustably screwed into the back portion 56 which is at the front sideof the cutting unit with respect to the direction of feed of the boardA, are binding screws 59 (only one of which is shown) and the inner endsof these are adapted to firmly bear upon'a gib 60, whereby the dove-tailway 55 is rrnly pressed upon by the gib 60 in securing the way 55 in therecess 58 of the stock 17. This gib 60 is located adjacent that side ofrecess `58 which inclines outwardly on the back portion 56. Preferablythe same side of the recess is'formed with a seat 61 for thecorresponding edge of gib 6G.

Screwed into the outer face of the lower back' portion 57 is aset-screw62 which is adjustable in such: portion and which is maintained in thedesired adjusted position by of a binding screw 63 which enters the backportion 57 from a lateral side.

When the screw 62 is set as shown in Fig. 1, its

end surface is level with the corresponding surface of the back `portion56. In this position of the set-screw 62 the cutting unit 16 may be setin the position illustrated in Fig. 1` In this position the cutting unitwith the cutters 4l, 42 are set so that a line through the center of thedove-tail way 35 will pass at right angles to its lower surface andthrough the center of the roll or disk l5, such line also passing midwayof the closest points of the cutting edges of the cutters. The cutters41, 42 would then out a groove in varying materials which will fold moreor less than a right angle according to the density and thickness of thestock material or board used, when the cutters are set at right anglesto each other,V or a different groove according to the 15C' anglebetween the faces of the cutters. A greater angle than ninety degreeswill cut a wider groove which will fold further toward and beyond aright angle, that is the board along the line of the groove may befolded to acute angles.

It will be understood from Fig. 1 that the feed rollers 10, 11 push theboard A between the roller or disk 15 and the cutters 41, 42, and thatthereby the cutters and roller 15 are caused to rotate according to thespeed and rotation of the rollers 10, 11. In the position shown in Fig.l the imaginary line before mentioned and which passes as explainedthrough the dove-tail way and through the axis of roller 15, indicatesthat at a point midway between, the closest points of the cutting edgesare intersected by such line and that a groove will be cut in the boardA whosc sides are inclined according to the inclination oi the cutters.When the cutters are so set, there is no tendency to push them together,but rather to push them apart, in cutting the shaving or chip C from theboard, in the act of forming the groove B therein. As soon as the boardA reaches the feed rollers 12,

113, these act to pull the board along and to continue the rotation ofthe cutters 41, 42.

In this connection reference may also be had to Fig. 2 from which itwill be seen that the cutters 41, 42 are arranged in planesintersectjing the roller or disk 15, which planes converge toward theroller so as to cut the groove along the path taken by the board A. Inthis connection it will also be understood that when the slide 24 hasbeen adjusted and the slides 37, 38 have been adjusted and set forsetting the cutters as desired with respect to their support, that inoperation the closest points of the cutting edges of the cutters lielaterally across the line of the groove which is being cut andsubstantially in planes which are inclined to the axis of the roller 15.

Referring now to Fig. 8 it will be seen that the entire cutting unit 16is disposed at an inclination. Such position is obtained by setting Athescrew 62 further into the stock 17 of the unit, so that when the unit isapplied to the dove-tailed way 55 of the beam 14, the tightening up ofthe set-screw 59 onto the gib 60 will the cutting unit in apredetermined tilted 'position which is determined by the screw 62 whichconstitutes a tilting screw. In a tilted position the cutters presentadvantages, which, if desired, may always be resorted to instead ofhaving them on the imaginary line heretofore mentcncd. That is to say,in any desired tilted position the cutters 41, 42 will be tippeddownwardly in iront and upwardly in the back. Such tipping causes thecutters to tend to pull apart, instead o having tendency to presstogether as when set straight over the center of the roller therebypositively keeping one cutter :from the other. Inasl ch as the cuttershave been set to converge along their flat outer faces to say ninety-vedegrees, as shown in Fig. 2 and 4, It possible with the tilting of thecutters to cut a groove say with an angle ot ninety degrees. Grooves ofdiierent angles may be cut by the saine angular setting or withdifferent angular setting, say of ninety degrees, by tilting the cuttingunit substantially as shown in 8. Here the degree of tilting which wouldbe comincnly resorted to has been somewhat exagg rated for the saire ofclearness. However, when the cutters are tilted as indicated, a iurtheradvantage is obtained in that the chip o1' shaving removed from thegroove in the board is drawn away from the latter if there is anytendency for it to adhere, but most important the chip is pulled awayfrom the board upwardly, if the cutters work in a downward position, asshown, and the chip thus lifted must iind its way out at a point abovethe closest points of approach o the cutting edges, the chip beingdischarged about as shown in Fig. 8, where it can be controlled andremoved without damage to the board. In practice under the presentdisclosed speciiic machine the chip or shaving is simply pressed backinto the groove by the end pair of feed rollers 12, 13,\and as the chiphasbeen fully detached from the board it is a very simple matter tocontrol and remove it from the board. This, however, would not have tobe done ii the roller l5 were a positively driven roller and the rollers10, 11, l2, 13 dispensed with.

The reasons why the cutters act as stated when they are tilted, are thefollowing:

Looking at Fig. 1 it will be seen that the cutter 42 be'ng inclinedappears as an ellipse and the long axis oi the ellipse is parallel withthe path oi the board. However, in Fig. 8, as indicated by dotted line,the major axis of the ellipse seen in viewing the tilted cutter 42indicates that this major axis is not parallel with the path of iced ofthe board. The points oi closest approach Yof the cutting edges of thecutters would hence be on a line at right angles to the major of theellipse of cutter 42, which indicates that they are set slightly behindthe vertical plane which passes through the axis of roller l5. Thismeans that any lines passing through the cutters in a plane with theadjacent surface of the board will converge slightly from iront to back.This furthermore means that ii' the cutters, for example, are set atninetyfive degrees, the forward edges of the cutters where they strikethe board may easily be caused by the said tilted position oi thecutters to cut a groove the walls of which are at an angle oi ninetydegrees. Inasrnuch as the chip or shaving must pass over the closestpoints oi approach of the cutters, which now removed slightly to therear, the chip is pulled away. Inasmuch as the chip or shaving is nowforced to enter a wider opening between the cutters than the openingthrough which it passes out, the chip is somewhat compressed between thecutters in the act of forcing it out.

The setting of the cutters when tilted is graphically indicated somewhatroughly in the diagram, Fig. 9. Here two lines are seen to converge,these representing lines which would pass through the cutters in a planecoincident with the plane of the adjacent surface of the board. At thepoints o, a located where the board cornes in Contact with the cuttingedges, the latter are more widely spaced apart than at the points b., bwhich indicate where the board' leaves the cutters. This view is merelygraphic and represents nothing in the way of proportions, as it isexaggerated for the sake oi clearness.

It will be recalled that the slides 37, 38 are offset one in advance ofthe other. Advantages are taken of this arrangement to set ono of thecutters in advance of the other. It has been found 'f in practice thatan easfer cutting out of the chip or shaving is accomplished because thecut at one side of the chip is obtained slight- 1y in advance of the cutat the other side, with "liti lessfriction than .when the cuttersy areset directly opposite each other, although the present invention is notrestricted to such oiisetting.

Obviously the invention as shown and described is capable cfa wide rangeotmodicationwithout departingfrom the spirit thereof as deiinedin thescope of theA appended claims.

What we claim as new is,- v

l. In means for `cutting a groove in fibrous board, the combination of abody having a pair of straight lateral, converging seats, each undercutand inclined lengthwisefat the same `anglaa pair of cutter slidesindependently movable one toward the other along the length of the-seatsand having guiding portions=entering and *comn plementary tothe seatsapair of opposed groove ing cutters mounted on the `slides in convergingplanes parallel with the converging se-ats, and means; for independentlyadjusting and `hiring each of the slides and its cutter whereby toobtain a ,variable lateral spacing of the cutters,

Zin means forcutting a groove in fibrous board, the combination of abody having a pair oi' straight lateral, converging seats, each inclinedlengthwise at the same angle, a pair of bifurcated cutter slidesindependently movable one toward the other along the length of theseats, the bifurcations being parallel and ex tending transversely ofthe seats, a pair of opposed, rotary disk-cutters. mounted in thebifurcations in converging planes parallel with the converging seats,and means for independently adjusting and fixing each of the slides andits cutter whereby to obtain a variable lateral spacing of the cutters.

3. In means for cutting a groove in iibrous board, the combination of asupporting stock, a slide member supported thereon and having a pair ofoutwardly converging seats inclined at the same angles, means forguiding the slide member from or toward the stock in the commondirection in which the seats converge, a pair of cutter slidesindependently movable along the seats, a pair of opposed rotarydisk-cutters mounted on the slides for an outward or inward movementtherewith in converging planes parallel with the converging seats, meansfor ad justing and iiXing the slide member in a plurality of positionsfrom or toward the stock, and means for independently adjusting andlixing each of the pair of slides and its cutter whereby to obtain avariable lateral spacing of the cutters.

4. In means for cutting a groove in iibrous board, the combination of asupporting stock, a slide member supported thereon and having a pair ofstraight, outwardly converging seats, inclined at the same angles, meansfor guiding the slide member rectilinearly from or toward the stock, inthe common direction in which the seats converge, a pair or cutterslides independently movable along the seats, and being otherwiseimmovable, a pair of opposed rotary disls--cutters mounted on the slidesagainst lateral movement for an outward or inward movement therewith inconverging planes parallel with the converging seats, means ioradjusting and iixing the slide member in a plurality of positions fromor toward the stools, and means for independently adjusting and fixingeach oi the pair of slides and its cutter wherebyto obtain a variablelateral spacing of the cutters.

5. In means for cutting a groove in fibrous board. the combination of asupporting stock, a

slide member supported thereon and having. a pair ofA depressed,outwardly'converging seats, inclined at the same angles, meansv forguiding the slide member from or towardthe. stock, in thecommondirection in which the seats converge,A a pair of cutter slidesdovetailed into and independently movable alongthe apair oi opposedrotary disk-cutters mounted on `the slides for an outwardv or inwardmovement therewith .in convergingplanes paraliel with the convergingseats, means for adjusting and xing the slidev member in a plurality ofpositions from or towardthe stock, and means for. independentlyadjusting and fixing each of the pair of slides and its cutter wherebyto.Y obtain a variable lateral spacing of the cutters.

S. In means for cutting a groove in iibrous board, the combination of .asupporting stock having two pair of posts which are suitably spacedapart the one from the other, a slide member guided in the spaces of thetwo pair,`

and having lateral Vportions guided in the remaining spaces Aseparatingthe two pair, the slide member also having a pair oi inclined seatsextending from the lateral portions and converging outwardly at the sameangles, a pair of cutter slides independently movable along the seats, apair of opposed rotary diskcutters mounted on the slides for an outwardor inward movement therewith in converging planes parallel with theconverging seats, means located beyond the two pair of posts, andcooperatively engaging the stock and the slide member, i'or adjustingand xing the slide member in a plurality of positions from or toward thestock, and means positioned at the outer edges of the lateral portionsfor independently adjusting and fixing each or the pair of slides andits cutter whereby to obtain a variable lateral sp cing of planes sothat the closest portions of their edges are directed away from theStoch, means ior rigidly mounting the stock on the'support, and meansfor adjusting and maintaining the stock and cutters at varying degreesof inclination with respect to the support.

8. In means for cutting a groove in nbrous board, the combination of acutter support, a stock or body, a pair of opposed, rotary disk cuttersmounted on the stock in converging planes so that the closest portionsor their are directed away from the stock, the stock having mountingmeans at its back and also means adapting the stock and cutters to beattached at different angles to the support.

9. In means for cutting a groove in fibrous board, the combination of acutter support, a Stock or body, a pair of opposed, rotary disk cuttersmounted on the stock converging planes so that the closest portions oftheir edges are directed away from the stock, the stock having mountingmeans at its back and also an adjustable back stop adapting the stoolsand cutters to be attached at different angles to the support.

10. In means for cutting a groove in fibrous board, the combination of acutter support, a stock or body, a pair of opposed, rotary disk cuttersmounted on the stock in converging planes so that the closest portionsor" their edges are directed away from the stock, the stock` havingspaced back portions of different heights and the space enabling tlie`stock to be mounted on the support, and the lower of the back portionsbeing provided with an adjustable stop to engage such support.

11. In means for cutting a groove in fibrous board, the combination of aboard supporting roller, a cutter support, a pair of opposed, ro tarydisk-cutters, means for maintaining the cutters in xed planesintersecting the roller and convergingly toward the roller, and meansfor adjusting the so maintained cutters to out bevel sided grooves ofvarying degrees of angularity in board, the closest cutting pointslaterally of the cutters being located one in advance of the other alongthe line of the groove to be cut.

12. In means for cutting a groove in brous board, the combination of aboard supporting roller, a cutter support, a pair of opposed, rotarydisk-cutters, means for maintaining the cutters in xed planesintersecting the roller and oon vergngly toward the roller, means foradjusting the cutters in their maintained planes, and means foradjusting the so maintained cutters to cut bevel sided grooves o1"varying degrees of angularity in boards'.

13. In means for cutting a groove in fibrous board, the combination of aboard supporting roller, a cutter support, a pair of opposed, rotary,disk-cutters arranged in planes intersecting the roller and oonverginglytoward the roller so as to cut along the path taken by the board, andmeans for mounting the Cutters so as to be rockable about the plane offeed of the board.

14. In means for cutting a groove in fibrous board, the combination of aboard supporting roller, a cutter support, a pair of opposed, rotary,disk-cutters arranged in planes intersecting the roller and converginglytoward the roller so as to out along the path taken by the board, meansfor maintaining the cutters in their converging planes, and means formounting the cutters so as to be rockable about the plane of feed of theboard.

JOHN T. ROBINSON. THEODORE A. SCHWAMB.

